Obviously, so does being a parent ("my baby is the most beautiful baby in the world"), being a child ("I have the best mom/dad ever") being a pet owner ("my dog/cat is just the sweetest pet you will ever meet"), being patriotic ("my country/city is the best country/city to live in) and being religious ("my religious figurehead is the best one")

The key word to these delusions is ... "devotion"!.. it is a necessary human trait... I would not want to know the person that is not somehow deluded/devoted about things